Sponge-like carbon can be used as a supercapacitor

The material is said to hold promise for energy storage in energy grids, electric cars and consumer electronics.

‘We synthesised a new sponge-like carbon that has a surface area of up to 3,100m² per gram. It also has much higher electrical conductivity and, when further optimised, will be superb for thermal management as well,’ said lead researcher Prof Rodney S Ruoff. ‘The processes used to make this porous carbon are readily scalable to industrial levels.

‘After we realised that we had a new carbon with a highly novel structure that showed superb performance as an electrode, we knew that this direction of research — to create carbon materials that consist of a continuous three-dimensional porous network with single-atom-thick walls — was likely to yield the optimum electrode material for supercapacitors.’

The process used by the university team to synthesise the carbon material involved using microwaves to exfoliate graphite oxide, followed by treatment with potassium hydroxide, which created a carbon full of tiny holes that can store a giant electrical charge when combined with an electrolyte.